Pin-jewel holder



(Model.)

P. GUNDORPH.

PIN JEWEL HOLDER.

No. 252,660. Patented Jan. 24,1882.

es. jizz/02502::

UNITED STATES PATENT OEEICE.

FERDINAND GUNDORPH, OF PORTLAND, OREGON.

P|N=JEWEL HOLDER.

SPECIFICATION forming part of Letters Patent No. 252,660, dated January 24, 1882.

Application filed November 23, 1881.

To aN whom it may concern:

Be it known that I, FEEDTNAND GUNDORPH, of Portland, in the' county of Multnomah, in the State ol'Oregon, have invented an improvement for a pin-jewel holder for setting the ruby-piu in the roller or disk on the shaft ot' the balance-Wheel in watches, of which the following is a specitication.

The nature or object of my invention is to secure a means of setting a ruby-pin in a halance-disk in a more perfect manner than hitherto, so that the said pin shall be parallel to the axis of the balance-shaft, and the plane face of same perfectly tangent to the circle of oscillation of the balance.

In Figure l is shown a plan, as seen from the top, and to the left an enlarged, view ofthe central part with pin, &c. In Fig. 2 is shown a section of the same parts, and Fig. 3 shows a plan of the under side of the above. The plans are about twice as large as the tool.

In setting a ruby-pin in the ordinary manner it is difficult to keep the parts true and square; but by the device. shown it is possible to set the piu true at all times and with certainty. The pin d, having a fiat side placed against the squared end of sliding piece b, operated by a spring, h, is pressed against two points, c, also true and square, (as regards lines,) b and c forming, as it were, jaws of a vice, clamped to (Model.)

gether by the spring h. The balance-disk for setting the pin in is laid on the portion around thecenter, and the end of the balance-shaft placed in the slot f, where it may pass downv ward and out of the Way. The hole in the edge of the disk for the pin-settin g is placed loosely over the piu, and a small grain ot' gum-shellac placed against it for fusion. The whole is now placed iu the flame of a spirit-lamp, and when the spring-thermometer g shows the proper point of heat ou the indicator the whole is removed and allowed to cool, i being so graduated that the melting-pointis always accurately shown. g is composed of two metals causing the expansion, as above. g and h are fastened to the faceplate 7c by screws, as also is lc toj. Two little pins, c, are onv either side of the spring h for moving the clamp-piece b back and forth by the end a in the fingers. This end a is turned under the edge of the face-plate le in such a way as to prevent its becoming disengaged or out of place.

I claim- .A pinljewel holder consisting of the parts a b c d cfg h j as a whole and in combination, as described, and for the purpose set forth.

FERDINAND GUNDORPH.

Attest:

C. B. TALBOT, JOHN VAN BEURDEN. 

